Gas-engine.



U. G. SPRADO. GAS ENGINE, APPLICATION FILED 00T.18, 1909.

Patentd June 2 1910.

5 [Ii-A5 WITNESSES ATTEIRNEY.

cent a. err-moo, or MILWAUKEE,

WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS COM PANY, OF MIL'WAUKEE, WISCONSIN, A CORPORATION 01? NEW JERSEY.

GAS-ENGINE.

V Specification of Letters Patent.

Patented J une '7, 1910.

Application filed October 18, 1909. Serial No. 523,332.

To all who-m it may concern:

Be it known that I, CARL G. SPRADO, a citizen of the United States, residing at Milwaukee,in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Gas-Engines, or which the following is-a specification. i

This invention relates to improvements in the construction of gas engines.

The object of the invention is to render an engine more-sensitive to governing.

The invention is particularly applicable to a two cylinder double acting four cycle gas engine. The cylinders of the engine may be in tandem, or parallel to each other, or radiating from the shaft.

One of the main features of the invention is an equalizing pipe connecting the suction chamber from which each cylinder takes its supply.

A clear conception of the invention can be obtained by referring to the accompanying drawing specifically showing a tandem engine and in which like reference charactors designate the same or similar parts in dili'erent views.

Figure is a plan engine cyhnders in tandem, havlng the lnvention applied thereto, a portion thereof being shown in section in two planes on the line L-H, Fig. 3. Fig. 2 is an elevation of the device shown in Fig. 1 a portion being in section to show a valve. Fig. 3 is a vertical section taken on the line lIIlII of Fig. 2 looking in the direction of the arrows. he cylinders 1 which are separated from each other by the tie-piece 8, have air chambers 5) and gas chambers 1.0 formed above each them. The gas chambers 10 are above the air chambers 9 and directly below the inlet valve mechanisms 11. These mechanisms 11 include the valves 112 which regulate the admission of gas and air into the cylinders 1 through the ports 12. Each of these valves 112 is adapted to open a pas sage between the chambers 10, 9, and simultaneously the corresponding port 12 between the chamber 9 and the chamber of the cylinder, 1. Conduits, 2, on one side of the cylinders 1, form connections between the gas pipes 16, 5, and the gas chambers 10. The governor or hand operated throttle valves 13 in the conduits, 2 control thepassage of gas therethrough. Similar conduits view of a pair of gn s;

3 on the opposite sides of the cylinders 1, form connections between. the air pipes 15, 4, and the air chambers 9, the passage of air in these conduits 3 being controlled by the throttle valves 14.

The pipe 7 on one side of the cylinders, a section of which is shown in Fig. 1, connects the air chambers 9. A similar pipe 6 on the opposite side of the cylinders 1, makes a connection between the as chambers 10. The pipes 6, 7, are of sudicient size to at all times maintain the respective connected chambers 9, 9, 10, 10, at the same pressures. This construction will then present a pair of connected chambers for gas having two throttle valves 13, L3, and a pair of connected chambers for air also having two throttle valves 14, 14, and 'ityis a vital consideration that the volume of thespace in each of the two fluid supply. reservoirs formed by these connected chambers be a minimum. This being so, will make the speed control of the engine through the governor operated throttle valves 13-, 14, exceedingly sensitive. I

During the operation of gine', the cycle of events is such that a suctionwill follow a suction in one of the cylinders 1 for two successive strokes of the engine. This will then be followed by a suction following a suction in the other. cylinder 1, for the next two successive strokes. The result of this sequence of events is that for each of the cylinders 1 the suction chambers 9, 10, between the throttle valves 13, 14, and the inlet valves 12, will be called this type. of on I upon to supply that cylinder 1 with charges for two successive strokes, whilefor the next two successive strokes it will not be called upon to supply charges. the pressure in these-chambers 1, 10, to vary. This variation is overcome in the present invention by connecting these chambers 9, 10, by the equalizing pipes G, 7, as above described.

The operation of this invention is there fore as follows: Supposing the cylinder end A to be supplied with a charge during its suction stroke, and end B exhausting, end C explodin and end 1) compressing. The supply o gas to end A will havetwo paths;

This would cause one a direct supply through the pipes 16, 5,

I the other indirect for both its gas and its air. During this stroke end A is compressing. end (l exhausting, and end D is exploding. Fm he 5rd stroke. of the engine,

. valves 12:. 1.3, 14, 14, because there is no large end (I will he under suction and will derive its supply of gas by two paths; first directly through pipe 16, conduit 2, past throttle valve 13 chamber 10 and past ports 12, the other indirectly through pipes 16, 5, conduit of the other cylinder 1, throttle alve 13 chamber 10, equalizing pipe (3, chamber 10 and inlet ports 12. The supply of air will similarly have two paths one direct and the other indirect. During this stroke, the end A is explodinq', the end 13 is compressing, and end I) is exhausting. For the fourth stroke of the engine, the end I) will be under suction and will have two sources of supply one direct and the other indirect for both its gas and its air. During this stroke end A will he exhausting, end ll exploding. and end C compressing. From this it follows that a suction supply of gas for any cylinder end is substantially onehalf directly from the supply pipe past a throttle valve and. substantially one-halt from the supply indirectly through conduit the throttle valve, and chamber 10 of the other cylinder 1 and thence through equalizing pipe (3. in the same Way the suction supply of air for any cylinder end is substantially one-half provided through the equalizing pipe 7. The pipes f3 and 7 may therefore he of cross section sutt cicnt. only 'l'or these halt supplies. These facts of half supply hy tne equalizing; pipes t3, 7, point. to

arv COHtflllSlOIl and an essential the ncces.

feature hereinahm'e referred to that the volume 01 space in each of the two fluid supply reservoirs formed by the connected air and chambers 9, t), 10, 10, is reduced to a minimum. This permits of quick response to the speed governor controlling the throttle amount of tiuid in these supply reservoirs.

It should he noted as a matter of information thatthe flow of fluids in the equalizing pipes t), Y, toward the cylinder A, B, dur} ing the first two strokes above described, and toward the cylinder C, 1), during the third and fourth strokes.

It should be understood that it is not desired to he limited to the exact details of construction shown and described, for 0hvious modifications will occur to a person skilled in the art.

it is claimed and desired to secure by Len .ters Patent 1. In a gas engine, the combination of a plurality of cylinders, a supply means for conducting fluid to each of the cylinders, a throttle valve in the supply means adjacent each of the cylinders. and an equalizing pipe connecting the supply means at. a point hetwcen one oi. said throttle valves and its adjacent. cylindm' and a point between another of said throttle valves and its adjacent cylinder.

2. In a gas engine, a plurality of cylinders. asupply means common to two of said cylinders. and an equalizing pipe connecting the supply means adjacent said two cylinders.

3. In a tandem engine, supply means tor the cylinders of said engine, throttle valves in said means :uljacent v aid cylinders. and an equalizing conduit connecting said supply means between said throttle valves and their corresponding cylinders.

4-. in a gas engii'ie, the combination of a plurality of cylinders, and a plurality of supply means for each of said cylinders, a portion of one of said supply means for one of said cylinders serving also as a portion of one of said supply means for another of said cylinders. 1

5. In a gas engine, the combination of a plurality of inlets to said engine, piping for supplyingfiuidto said inlets, and a pipe connecting said supply piping adjacent two of said inlets. 1

(3. In a gas engine. the combination of a plurality of cylinders, a chamber formed adjacent and in communication with each of two ot said cylinders. piping supplying fluid to each of said chambers, and an equalizing pipe connecting said cl'iamhcrs.

In testimony whereof, I atiix my signature in the presence of two Witnesses.

W itnesscs ll. CASE, G. F. DEWEiN. 

